perfoliate
adjective
per·fo·li·ate ˌpər-ˈfō-lē-ət 
ˈpər-
: having the basal part naturally united around the stem
a perfoliate leaf of a honeysuckle
Word History
Etymology
New Latin perfoliata, an herb having leaves pierced by the stem, from Latin per through + foliata, feminine of foliatus foliate
First Known Use
1670, in the meaning defined above